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Old 24th December 2013, 12:17 PM   #3091
ttan98 is offline ttan98  Australia
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Luck Cat,

Do you still a pair of VSSA PCBs and the associated hard to get components left over from the last group buy, I am interested in purchasing a stereo pair.
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Old 25th December 2013, 11:24 AM   #3092
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Quote:
Originally Posted by hose4 View Post
Dear Lazy cat!

As you know my Vssa project has been finished few months ago.
My new 1200W power supply is waiting for the new Xmas present.
I can hardly wait for the new boards and box.

BTW nice measurements. Did you try with different feedback caps? Would be nice too see if there is a change in spectrum? You could use (nichicon fg, mundorfs, vs panasonic fc and fr, and large tantallums)

Hi

Last details to sort out before releasing the series has to be done.

Regarding capacitors, I Will probably test with only one different brandname just to see and evaluate the amount of measured difference caused by changing the caps. I think the pattern will emerge quite clearly.
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Old 25th December 2013, 11:26 AM   #3093
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Originally Posted by vgeorge View Post
One more VSSA finished.
Power supply is from connexelectronic 36V.
Chassis made from aluminum sheets.
Very nice finish vgeorge.

Any problem with GND loops, hum etc.?

Speakers will be ...

What other amps you have to compare to?

Regards, L.C.
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Old 25th December 2013, 11:27 AM   #3094
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Originally Posted by ttan98 View Post
Luck Cat,

Do you still a pair of VSSA PCBs and the associated hard to get components left over from the last group buy, I am interested in purchasing a stereo pair.
Unfortunately not. But hey please wait a little and chech out for the First One amp module.
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Old 25th December 2013, 11:34 AM   #3095
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Originally Posted by danny_66 View Post
Hi Andrej,
Nice declining distortion spectra of the First One !
I'm looking forward to it.
There's a new version of ARTA to play with.
Besides ARTA I've also used REW5 with my speakers, it seems that you can also use REW5 for amplifier measurements.
Regards,
Danny
Hi danny_66

Yes realy nice monotonic declining harmonic spectrum I got from the First One. Will check out the spectrum also with lower power levels ie. 1 W and 10 W, because input sine signal from the card is much clearer then.

For now ARTA is sufficient for my work showing me all the data I need, will do upgrading soon.

Thanks for the tips.
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Old 25th December 2013, 11:39 AM   #3096
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Originally Posted by RNMarsh View Post
For 10 pieces or a few more, it is no problem.

Thx-RNmarsh
For few hundreds it is completely different story ...
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Old 25th December 2013, 12:37 PM   #3097
vgeorge is online now vgeorge  Greece
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Quote:
Originally Posted by Lazy Cat View Post
Very nice finish vgeorge.

Any problem with GND loops, hum etc.?

Speakers will be ...

What other amps you have to compare to?

Regards, L.C.
No problems with hum or ground loops. Completely silent.
Speakers are horns around 100dB. Have a look here : My island speakers
I have Aleph J, Baby Huey (el84 pp from another thread here) and Sonny' s TSSA running in class A with dual SMPS.
This one and Sonny' s are my favorites do far. TSSA maybe a tad sweeter on the top, VSSA a little more dynamic. Differences depend on taste and mood mostly. I love both of them so far.
One note though, I prefer both of them without the bypass feedback capacitors.
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Old 25th December 2013, 01:30 PM   #3098
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Yes I remember from TSSA, very nice speakers, also having 5-way horns here. Amazing where VSSA found its home, love it. What's the source?
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Old 25th December 2013, 01:39 PM   #3099
vgeorge is online now vgeorge  Greece
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Main source is VPI Aries, SME IV, Shelter 901, Salas folded cascode RIAA, Salas 6V6 line pre (used as buffer).
I also have a modified SONY cdp-x 555es for CD.
For the subs I have a dbx driverack PA driving a McCormack DNA1.
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Old 25th December 2013, 07:26 PM   #3100
ttan98 is offline ttan98  Australia
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Originally Posted by Lazy Cat View Post
Unfortunately not. But hey please wait a little and chech out for the First One amp module.
What is this First One Amp module, any info? Is this your next project?
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